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TM 11-5820-358-10 

DEPARTMENT OF THE ARMY TECHNICAL MANUAL 



OPERATOR'S MANUAL, 

RADIO RECEIVER R-390A/URR 




HEADQUARTERS, DEPARTMENT OF THE ARMY 

16 JANUARY 1961 



WARNING 



DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT 

Be careful when working on the 240-volt power supply and the circuits 
connected to it, or on the 115/230-volt ac line connections. Before con- 
necting the receiver to an ac source, be sure that the chassis is connected 
to the same ground as the ac source. 



DON'T TAKE CHANCES! 



Technical Manual 
No. 11-5820-358-10 



*TM 11-5820-358-10 



HEADQUARTERS, 
DEPARTMENT OF THE ARMY 
Washington 25, D. C, 16 January 1961 



RADIO RECEIVER R-390A/URR 

Paragraph Page 

Chapter 1. INTRODUCTION 
Section I. General 

Scope 1 3 

Forms and records 2 3 

II. Description and data 

Purpose and use 3 3 

System application 4 3 

Technical characteristics 5 5 

Components of Radio Receiver R-390A/URR 6 5 

Description 7 5 

Additional equipment required 8 6 

Chapter 2. OPERATING INSTRUCTIONS 
Section I. Controls and instruments 

General 9 8 

Receiver controls and indicators 10 8 

IX. Operation 

Preparing receiver for reception 11 9 

Calibration 12 9 

Tuning receiver for voice reception 13 9 

Mew or cw reception 14 9 

Reception of frequency-shift signals 15 9 

Single-sideband reception 16 9 

Stopping procedure 17 24 

Antijamming instructions 18 24 

Chapter 3. MAINTENANCE INSTRUCTIONS 

Scope of operator's maintenance 19 26 

Preventive maintenance 20 26 

Checking fuses 21 26 

Visual inspection 22 26 

Operational checklist 23 26 

Chapter 4. SHIPMENT AND LIMITED STORAGE AND DEMOLITION 
TO PREVENT ENEMY USE 

Section I. Shipment and limited storage 

Disassembly '• 24 30 

Repacking for shipment or limited storage 25 .30 

II. Demolition of materiel to prevent enemy use 

Authority for demolition 26 30 

Methods of destruction • 27 30 

Appendix I. REFERENCES , 31 

II. BASIC ISSUE ITEMS LIST, RADIO RECEIVER R-390A/URR 32 

*This manual supersedes so much of TM 11-856A, 20 January 1956, including CI, 19 March 1956; C2, 17 
May 1956; C3, 23 November 1956; C4, 7 June 1957; C5, 23 July 1958, and C6, 13 November 1958, as pertains to 

the operation of the equipment. x 



1 




Figure 1. Radio Receive?- R-390A/URR. 



2 



CHAPTER 1 
INTRODUCTION 



Section II. 

1. Scope 

This manual describes Radio Receiver R- 
390A/URR (fig. 1) and covers its operation, 
and operator's maintenance. It includes clean- 
ing and inspection of the equipment and re- 
placement of parts available to first echelon 
maintenance. Throughout this manual, Radio 
Receiver R-390A/URR is referred to as the 
receiver. 

2. Forms and Records 

a. Unsatisfactory Equipment Reports. 

(1) Fill out and forward DA Form 468 
(Unsatisfactory Equipment Report) 
to the Commanding Officer, U. S. 
Army Signal Materiel Support 
Agency, ATTN: SIGMS-ML, Fort 
Monmouth, N. J., as prescribed in AR 
700-38. 

(2) Fill out and forward AF TO Form 29 
(Unsatisfactory Report) to the Com- 
mander, Air Materiel Command, 
Wright-Patterson Air Force Base, 
Ohio, as prescribed in AF TO 00- 
35D-54. 



GENERAL 

b. Report of Damaged or Improper Ship- 
ment. Fill out and forward DD Form 6 (Re- 
port of Damaged or Improper Shipment) as 
prescribed in AR 700-58 (Army), Navy Ship- 
ping Guide, Article 1850-4 (Navy), and AFR 
71-4 (Air Force). 

c. Preventive Maintenance Form. Prepare 
DA Form 11-238 (fig. 15), (Maintenance 
Check List for Signal Equipment (Sound 
Equipment, Radio, Direction Finding, Radar, 
Carrier, Radiosonde, and Television)) in ac- 
cordance with instructions on the form. 

d. Parts List Form. Forward DA FORM 
2028, (Recommended Changes to DA Technical 
Parts Lists or Supply Manuals 7, 8, or 9) di- 
rectly to the Commanding Officer, U. S. Army 
Signal Materiel Support Agency, ATTN: 
SIGMS-ML, Fort Monmouth, N. J., with com- 
ments on parts listings in Appendix II. 

e. Comments on Manual. Forward all other 
comments on this publication directly to the 
Commanding Officer, U. S. Army Signal Mate- 
riel Support Agency, ATTN: SIGMS-PA2d, 
Fort Monmouth, N. J. 



Section II. DESCRIPTION AND DATA 



3. Purpose and Use 

a. The receiver (fig. 1) is a general-purpose 
receiver for use in both fixed and mobile appli- 
cations. The receiver provides reception of 
continuous-wave (cw) , modulated-continuous- 
wave (mew), amplitude-modulated (am.), fre- 
quency-shift keyed (fsk), and single-sideband 
(ssb) signals. 

b. The receiver furnishes audiofrequency 
(af) output power to a local loudspeaker and 
headset or a balanced line. An intermediate 
frequency (if.) output is also provided so that 
received radio teletypewriter signals may be 
fed to other equipment for conversion into 
signals usable by teletypewriter printers. 

c. The calibration of the receiver is ac- 



curate to within 300 cps; this permits use of 
the receiver as a frequency meter., 

4. System Application 

a. Space-Diversity Receiving System. 

(1) Two or three receivers can be con- 
nected as a space-diversity receiving 
system for reception of voice signals 
(fig. 2). This system provides sub- 
stantially uniform audio output to a 
loudspeaker or headset, minimizing 
the effect of fading signals. 

(2) Rhombic or doublet antennas spaced 
at least 600 feet apart are connected 
to the two receivers. 

/>. Space-Diversity Radio Teletypewriter 



3 



System. Figure 3 shows two receivers con- 
nected in a space-diversity radio teletypewriter 
system. The doublet or rhombic antennas feed 
the incoming frequency-shift signals to the 
receivers. The outputs of the receivers are 
applied to a converter which provides diversity 
combining and produces direct current (dc) 
signals for the operation of teletypewriter 
equipment. 

c. Single-Sideband Radio Teletypewriter 
System. A receiver and a single sideband con- 
verter may be connected as shown in figure 4. 



This system permits the reception of single- 
sideband (ssb) signals, occupying 12 kc of rf 
spectrum space divided into two 6-kc sidebands, 
one 6-kc sideband on each side of a reduced 
carrier. A double-sideband signal, either am. 
or phase-modulated (pm), occupying up to a 
total of 12 kc of spectrum space also can be 
received. This system is used primarily for 
the reception of multichannel radio-teletype- 
writer transmissions. For additional informa- 
tion, refer to TM 11-649. 



ANTENNAS SPACED 
APPROXIMATELY 
600 FT APART 

W V 



RADIO RECEIVER 
R-390A/URR 
(RCVR A) 



RADIO RECEIVER 
R-390A/URR 
(RCVR-B) 



LOUDSPEAKER 
OR 
HEADSET 



TM5820-358-I0-2 



Figure 2. Space-diversity receiving system, block diagram. 



ANTENNAS SPACED 
APPROXIMATELY 
600 FT APART 

V V 



RADIO RECEIVER 
R - 390A/URR 
(RCVR A) 



RADIO RECEIVER 
R-390A/URR 
(RCVR B) 



CONVERTER 
| CHANNEL A| 

jCHANNEL B | 



TELETYPEWRITER 
SET 



TM5820-358-I0-3 



Figure 3. Space-diversity radio teletypewriter receiving system, block diagram. 



4 



7 








► 


RADIO RECEIVER 


» 


SINGLE -SIDE BAND 




R-390A/URR 




CONVERTER 



TERMINAL 




SEVERAL 


» 


TELETYPEWRITER 
SETS 


EQUIPMENT 





TM5820- 358-10-4 

Figure 4. Single-sideband radio teletypewriter receiving system, block diagram. 



5. Technical Characteristics 

Frequency range .... 0.5 to 32 mc. 

Type of signals Cw, mew, voice, ssb, fsk. 
received 

Type of tuning Continuous; frequency 

read directly on coun- 
tertype indicator. 

Method of Built-in crystal-controlled, 

calibration 

Calibration points .. Every 100 kc. 

Power source 115 or 230 volts ac ±10%, 

48 to 62 cps. 

Power input 250 watts total ; 140 watts 

with OVENS switch 
turned to OFF. 



Antenna 

requirements : 

Unbalanced .... Straight wire of random 
length or vehicular- 
mounted whip. 
Balanced 125-ohm terminating im- 

pedance ; matches 50- to 
200-ohm balanced or 
unbalanced transmis- 
sion line by use of adap- 
ters. 

6. Components of Radio Receiver 
R-390A/URR 

a. Components. The components of Radio 
Receiver R-390A/URR are listed in the fol- 
lowing table: 



Quantity 


Item 


Fig. No. 


Height 
(in.) 


Depth 
(in.) 


Width 

(in.) 


Unit weight 
(lb) 


1 


Radio Receiver 
R-390A/URR 


1 


10 15/32 


16 19/32 


19 


75 


2 


TM 11-5820-358-10 












1 set 


Running spares 
(b below) 


5 








1 



b. Running Spares, (fig. 5). The following 
is a list of running spares except as noted. 



Quantity 


Item 


1 


Electron tube, OA2 


1 


Electron tube, 6AK6 


1 


Electron tube, 6C4 


1 


Electron tube, 6DC6 


1 


Electron tube, 26Z5W 


1 


Electron tube, 5654/6AK5W 


2 


Electron tube, 5749/6BA6W 


2 


Electron tube, 5814A 


5 


Fuses, 3-ampere, 250-volt 


1 


Lamp, incandescent, 6-volt, 0.2-ampere, 




Federal Spec. No. W-L-ll 


1 


Resistor, current-regulating 


5 


;l Fuses, % -ampere, 250-volt 


5 


a Fuses, Vs -ampere, 250-volt 



n Only on receivers bearing Order No. 15-PHILA-56, serial numbers 2683 
and above, and Order No. 14385-PHILA-58. 



7. Description 

a. The receiver (fig. 1 and 6) is designed 
for mounting in a standard 19-inch rack or a 
table-top cabinet. 

b. All operating controls, indicators, and a 
PHONES jack are located on the front panel. 
Two handles are provided to aid in removal 
of the receiver from the rack or cabinet. The 
chassis is enclosed by dust covers which may 
be removed when the receiver is installed in a 
cabinet. 

c. Antenna connectors, operating and spare 
fuses, a power cord, an if. connector, an 
OVENS switch, terminal boards, and special 
tools are mounted on the rear panel (fig. 7). 



5 



0A2 




6AK6 



6C4 



V605 



5749/6BA6W 



60C6 





V50I 
V502 
V503 
V505 
V508 
V70I 




V504 
V603 
OR 
V604 



5654/6AK5W 



V20I 



if 

V207 
V40I 



2625W 



V80I 
V802 



3-AMP 

a 



u 



FIOI 




V202 
V203 
V204 

OR 
V606 



1/4-AMP 







FI02 



W-L-l I 



58I4A 



lij 

III! 



V205 
V206 
V506 
V507 
V60I 
V602 



1/8-AMP 



a 



I 101 
1102 



NE-45 

4 

1103 



TJ3I1M0J 




FI03 



RT5I0 



Figure 5. Running spares. 



TM5820-358-I0-5 



Cutouts are provided to permit access to in- 
ternal controls. 

8. Additional Equipment Required 

The following material is not supplied as a 
part of Radio Receiver R-390A/URR but is 
required for its operation. The connectors re- 
quired will depend on the particular installa- 
tion. 



Antenna : 

Balanced 

Unbalanced 

Low-impedance 
transmission 
line: 

Balanced 

Unbalanced 



Doublet or rhombic. 
Random-length straight- 
wire or whip. 



50 to 200 ohms. 
70-ohm coaxial cable. 



6 



Connector Connector Plug UG- 917/URR 

573/U or Connector (Mobile) 

Plug PL-259. CY-1216/U or CY- 

Headset Headset Navy type CW- 979/URR 

49507 or equivalent Adapter Connector Adapts Connector i'lug 

600-ohm headset. UG-970/U PL-259 on unbalanced 

Cord Headset Cord CX- antenna lead-in to bal- 

1334/U, or equivalent. anced antenna input. 

Loudspeaker LS-166/U, or equivalent. Adapter Connector Adapts Connector Plug 

Mounting and hous- Standard 19-inch rack or UG-971/U UG-573/U on unbal- 

ing facilities cabinet such as: anced antenna lead-in 

(Fixed) *° balanced antenna 

CY-1119/U or CY- in P ut - 

fac DIAL Ce<vT«>L 69 vrSTe.A.c U>c-K uJi Sc. lsa/T, L »T STofi$. 

SrcP. T** ***** CO* Be To*"** T° A " T 



7 



^CtAjJ ^ ^ffr 1 CHAPTER 2 

OPERATING INSTRUCTIONS 



Section I. CONTROLS AND INSTRUMENTS 



9. General 

Haphazard operation or improper setting of 
the controls can result in poor reception; 
therefore, it is important to know the function 
of every control. The actual operation of the 
equipment is given in paragraphs 11 through 
18. 

Cautions : 

1. Do not turn the MEGACYCLE CHANGE 

10. Receiver Controls and Indicators (fig. 6) 



control beyond 00 or 31 megacycles. 

2. Do not turn the KILOCYCLE CHANGE 
control beyond 000 counterclockwise or 999 
clockwise. If a + or — appears in the third 
frequency indicator column from the left, the 
control has been turned too far. 

3. Do not turn the FUNCTION switch coun- 
terclockwise beyond OFF or clockwise beyond 
CAL. 



Control or indicator 


Function 


LINE LEVEL meter 


Indicates level of balanced-line audio output. 


LINE METER switch 


Meter switch has four positions: 

C'f / ; Pn r J* ff r t 

jus rui c/j&ci' 

OFF Disconnects meter from balanced-line audio 
output. 

+ 10 Adds 10 vu to LINE LEVEL meter vu indication. 

Reads LINE LEVEL meter directly. 

— 10 Subtracts 10 vu from LINE LEVEL meter indica- 
tion. 


LINE GAIN control 


Controls level of signal applied to balanced-line audio output 
terminals. 


AGC switch 


Determines rapidity of change in gain of receiver for a change 
of signal strength. 


LIMITER switch and control 


Increasing clockwise rotation of control increases reduction of 
static interference. 


CARRIER LEVEL meter 


Indication of db with RF GAIN control at 10 corresponds to an 
input signal of approximately 2 microvolts. 


BANDWIDTH switch 


Causes the receiver to reject frequencies that differ from the carrier 
frequency by more than the amount adjusted for. 


BFO switch 


Makes cw signals audible. 


BFO PITCH control 


Varies tone when receiving cw signals. 


AUDIO RESPONSE switch 


Sw Pos Effect 

Sharp 800 cps tone is loudest; used for cw. 
Wide Most voice frequencies are heard. 


BREAK IN switch 


Permits break-in operation with proper connections have been 
made at rear panel. 


FUNCTION switch 


Function switch has five positions. 

Sw Pos Effect 

OFF Receiver is turned completely off. 

STAND BY Receiver inoperative, but ready for instant use. 



8 



Control or indicator 


Function 




AGC ELeceiver operative, with gain controlled auto- 
matically. 




MGC E!,eceiver operative, with gain controlled by RF 
GAIN control or by an external control. 




Cal Permits calibration of the tuning system at 
100-kc checkpoints. 


ANT TRIM control 


Permits peaking of received signal to maximum value. 


DIAL LOCK 


When turned clockwise, locks KILOCYCLE CHANGE control to 
prevent accidental change of setting. 




When turned clockwise, disengages frequency indicator from 
KILOCYCLE CHANGE control for calibration purposes. 


LOCAL GAIN control 


Controls level of af signal applied to local headset or loudspeaker. 


RF GAIN control 


Manual control of amplification of received signal. 


MEGACYCLE CHANGE control 


Selects any one of 32 tuning bands in steps of 1 megacycle; 
changes reading of first two digits of frequency indicator. 


KILOCYCLE CHANGE control 


Tunes receiver to any frequency within a 1-megacycle band; 
changes reading of last three digits of frequency indicator. 


PHONES jack 


Provides means of connecting headset to receiver. 



Section II. OPERATION 



1 1 . Preparing Receiver for Reception 

A sample frequency of 07.275 megacycles 
will be used in paragraphs 11 through 15; it 
is understood that the operator will substitute 
the desired frequency. For preparatory pro- 
cedure, refer to figure 8. 

12. Calibration 

The receiver is now ready for calibration. 
To maintain maximum tuning accuracy, cali- 
brate the frequency indicator at the 100-kc 
point nearest the desired frequency. Recali- 
brate whenever the MEGACYCLE CHANGE 
control is turned. Start with the controls set 
as in paragraph 11. For calibration procedure, 
refer to figure 9. 

13. Tuning Receiver for Voice Reception 

Start with controls set as in paragraph 11. 
For voice reception tuning procedure, refer to 
figure 10. 

14. Mew or Cw Reception 

Set up the controls the same as for voice 
reception (para 13). For mew or cw reception, 
refer to figure 11. 



15. Reception of Frequency-Shift Signals 

The following procedure can be used for 
tuning the receiver to frequency-shift signals, 
unless another procedure is given in the tech- 
nical manual covering the particular receiving 
system. The receiver requires exact tuning for 
this type of operation. The entire procedure 
applies only to systems that use the audio out- 
put of the receiver, such as Radioteletype 
Terminal Equipment AN/FGC-1. Omit the 
procedure given in step 4, figure 12, with 
equipments that use the if. output of the re- 
ceiver, such as Frequency Shift Converter 
CV-116/URR. Set up the receiver the same 
as for mew or cw reception (para 14). For re- 
ception of frequency-shift signals, refer to 
figure 12. 

16. Single-sideband Reception 

Tuning the receiver for ssb reception must 
be done accurately if this type of signal is to 
be received. Calibrate the receiver as shown in 
paragraph 12. Start with the receiver set up 
as in paragraph 14. For ssb tuning procedure 
refer to figure 13. 



9 




10 



1 Turn the FUNCTION switch to AGC Al- 3 Turn the LINE GAIN to O. 

low the receiver to warm up for several 
minutes before operating it. 




5 Turn the LOCAL GAIN control to 6. 



TM5820- 358- 10-14® 

Figure 8®. Preparing receiver for reception (part 1 of 2). 



12 




6 Turn the BANDWIDTH switch to 8. 




8 



Turn the AGC switch to MED. 






Turn the AUDIO RESPONSE switch to 



WIDE. 




Turn the LIMITER control to OFF. 




10 Turn the DIAL LOCK to the left until it 
stops. 



TM5820-35 8-IO-l4@ 



Figure 8®. Preparing receiver for reception (part 2 of 2). 



13 




1 Turn the BANDWIDTH switch to .1 . 4 Turn the FUNCTION switch to CAL. 





3 Turn the BFO PITCH control to O. 6 Turn the KILOCYCLE CHANGE control to 

the 100-kc point nearest the desired fre- 
quency. 

TM5820-358-I0-I5© 



Figure 9®. Calibration (part 1 of 2). 



14 




7 Turn the ZERO ADJ knob to the right 9 Adjust the KILOCYCLE CHANGE control 

until it stops. f° r a maximum indication of the CARRIER 

LEVEL meter (step 6). 




O Adjust the ANT TRIM knob to obtain a 
maximum indication of the CARRIER LEVEL 
meter. 




10 If the BFO PITCH control does not 
produce a zero beat at 0, tune it for zero 
beat, loosen the knob screw, and adjust 
the knob to zero without turning the shaft. 
Tighten the knob screw. 



11 Turn the ZERO ADJ knob to the left un- 
til it stops. The dial is now calibrated accu- 
rately (step 7). 

TM5820- .358-'lO-l5 ® 

J 

Figure .9®. Calibration (part 2 of 2). 



15 




1 Turn the KILOCYCLE CHANGE control 
slightly toward the left or right of the desired 
station for a maximum CARRIER LEVEL meter 
indication (the MEGACYCLE CHANGE con- 
trol has been set during calibration). 




i 



J Turn the DIAL LOCK knob to the right 
until it stops. 




2 Adjust the ANT TRIM control for a max- 
imum CARRIER LEVEL meter indication. 



<8) 




Adjust the LOCAL GAIN control for a 
comfortable volume level. 




If there is excessive noise, turn the LIM- 
ITER control to the right as needed. 



TM 5820-358 - 10 - 16© 



Figure 10®. Tuning receiver for voice reception (part 1 of 2). 



16 



6 If the signal fades rapidly, turn the AGC 
control to FAST. 



8 The LINE METER switch (when used) is 
usually set at 0. 



WWW 




/ If another station is interfering, turn the 
BANDWIDTH switch to 4, or if necessary to 2. 




9 When the LINE METER switch is set at 0, 
the LINE GAIN control is usually adjusted for 
a LINE LEVEL meter indication at the VU 
imark. 




TM5820-358 - 10-16® 



Figure 10®. Tuning receiver for voice reception (part 2 of 2). 



17 



1 Turn the BFO switch to ON. 



4 Turn the AGC switch to SLOW. If keying 
is at such a slow speed that noise is heard 
between characters, perform steps 5 and 6. 




fortable tone. 




3 Turn the BANDWIDTH switch to 2, or if 
necessary to a lower position, to reduce ad- 
jacent channel interference. 



Figure 11®. Mew or 




Reduce the RF GAIN control setting to 
prevent blocking. For greater selectivity dur- 
ing cw reception, perform steps 7, 8, 9, 10, 

QnC ' TM5820-358- 10 - 170 

reception (part 1 of 2). 



18 



Turn the BANDWIDTH switch to .1. 



9 Tune the KILOCYCLE CHANGE control 
for zero beat. 




SHARP. 

TM5820- 358- 10-17 (2) 

Figure 11®. Mew or cw reception (part 2 of 2). 



19 



I Turn the BANDWIDTH switch to 2. (For 
filter-type equipment, such as Radioteletype 
Terminal Equipment AN/FGC-1, where au- 
dio frequencies of 2,125 and 2,975 cps are 
used, turn the BANDWIDTH switch to 4.) 




2 Turn the FUNCTION switch to AGC. 



3 Tune the KILOCYCLE CHANGE control 
to the desired frequency; then readjust it 
slightly until mark and space signals with 
the same tone are heard. 




4 Adjust the BFO PITCH control until the 
teletypewriter prints good copy. 




20 




6 Turn the LINE GAIN control to 10. The 
LINE LEVEL meter should deflect fully to the 
right. 




7 Adjust the ILIMITER control for a LINE 
LEVEL meter indication at the VU mark. 



TM5820-358 - 10-18 @ 

Figure 12®. Reception of frequency -shift signals (part 2 of 2). 



21 



1 Turn the FUNCTION switch to MGC. 



3 Turn the LOCAL GAIN control to 6. 




2 Turn the RF GAIN control to 6. 




4 Turn the BANDWIDTH switch to 2 for a 
2-kc bandwidth, or to 4 for a 4-kc bandwidth. 



TM5820-358 - 10-19© 



Figure 13®. Single-sideband reception (part 1 of 2). 



22 



Turn the BFO switch to ON. 



7 Tune the KILOCYCLE CHANGE control 
to the carrier frequency +1 kc for a 2-kc 
bandwidth, or f 2 kc for a 4-kc bandwidth if 
the upper sideband is used (-1 kc or -2 kc 
respectively if the lower sideband is used). 




6 Set the BFO PITCH control at -1 for up- 
per sideband reception with a signal 2-kc 
wide, or -2 for a 4-kc signal width ( + 1 or 
+ 2 respectively for lower sideband recep- 
tion). 



8 Adjust the BFO PITCH and/or KILO- 
CYCLE CHANGE control slightly for the most 
intelligible reception (steps 6 and 7). 



9 Adjust the LOCAL GAIN and RF GAIN 
controls for the desired audio level (steps 2 
and 3) . 



TM5820-358 -10-19 @ 



Figure 13®. Single-sideband reception (part 2 of 2). 



23 



17. Stopping Procedure 

When the receiver is not to be used but is to 
be maintained in a state of readiness, turn the 
FUNCTION switch to STAND BY. 

Caution: The FUNCTION switch should not 
be left in STAND BY for more than 30 min- 
utes. Under this condition, the life of certain 
vacuum tubes may be shortened. For stopping 
procedure, refer to figure 14. 

18. Antijamming Instructions 

When it is determined that the receiver is 
being jammed, promptly inform your immedi- 
ate superior officer. To provide maximum 
intelligibility of jammed signals, use the pro- 
cedures given for each type of operation. 

a. When receiving jammed voice signals, 
follow the procedures in the order indicated be- 
low until the signal is heard with the least 
amount of interference. 

(1) Turn the KILOCYCLE CHANGE 
control very slowly through several 
dial markings on either side of the 
desired signal. Some separation of 
the desired signal from the jamming 
signal may be achieved. 




(2) Turn the BANDWIDTH switch to 4 
or 2, whichever gives better results. 
Slowly tune as described in (1) above. 

(3) Adjust the ANT TRIM control to the 
point where the signal is heard with 
the least amount of interference. 

(4) If the noise is severe, adjust the 
LIMITER control as required. 

(5) When the jamming signal is weak, 
turn the FUNCTION switch to MGC 
and the RF GAIN control counter- 
clockwise. The interfering signal may 
be reduced enough to permit the de- 
sired signal to come through. 

(6) If these steps do not provide a read- 
able signal, request a change of fre- 
quency and call sign. 

(7) Request the use of cw operation, if 
permissible (b below). 

(8) If possible, change the direction, 
length, and height of the antenna. 
This may reduce the jamming effec- 
tiveness so that some degree of satis- 
factory reception is obtained. 

(9) If the jamming prevents communica- 
tion, report this fact to your immedi- 





1 When the receiver is not to be used but 
is to be maintained in a state of instant 
readiness, turn the FUNCTION switch to 
STAND BY. 




A To shut the receiver off, turn the FUNC- 
TION switch to OFF. 



Caution: Do not leave the FUNCTION switch 
in STAND BY for more than 30 minutes, be- 
cause the life of certain vacuum tubes may 
be shortened. 



TM5820 - 358 -10- 20 



Figure 14. Stopping procedure. 



24 



site superior. Keep your receiver 
tuned to the desired signal; continue 
to operate. 

h. When receiving jammed cw or mew sig- 
nals, follow the procedures in the order indi- 
cated below until satisfactory reception is 
established. 

(1) Turn the KILOCYCLE CHANGE 
control very slowly through a few dial 
markings on either side of the desired 
signal. Some separation of the de- 
sired signal from the jamming may 
be achieved. 



(2) Turn the BANDWIDTH switch to 1 
or .1 and turn the AUDIO RE- 
SPONSE switch to SHARP. Slowly 
tune as described in (1) above. 

(3) Reset the BFO PITCH control; it 
may be possible to separate the tone 
of the desired signal from the jam- 
ming signal to provide readability. 

(4) Perform the procedures indicated in 
a(3) through (6), (8), and (9) above. 

c. When receiving frequency-shift signals, 
refer to the technical manual on the particular 
receiving system for antijamming instructions. 



25 



CHAPTER 3 
MAINTENANCE INSTRUCTIONS 



19. Scope of Operator's Maintenance 

a. The following is a list of maintenance 
duties normally performed by the operator of 
Radio Receiver R-390A/URR. These proce- 
dures do not require special tools or test equip- 
ment. 

b. Operator's maintenance for Radio Re- 
ceiver R-390A/URR consists of the following: 

(1) Preventive maintenance (para 20). 

(2) Visual inspection (para 22). 

(3) Operational check (para 23). 

(4) Replacement of defective fuses (para 
21). 

20. Preventive Maintenance 

a. DA Form 11-238. DA Form 11-238 (fig. 
15) is a preventive maintenance checklist to 
be used by the operator. Items not applicable 
to the receiver are lined out in the figure. 
References in the ITEM block in the figure are 
to paragraphs that contain additional mainte- 
nance information pertinent to the particular 
item. Instructions for the use of the form 
appear on the form. 

b. Items. The information shown in the 
chart below is supplementary to DA Form 
11-238. The item numbers correspond to the 
ITEM numbers on the form. 



Item Maintenance procedures 

2 Use a clean cloth to remove dust, dirt, mois- 

ture, and grease from the exteriors of cases, 
racks, mounts, transmission lines, headsets, 
and front panel controls. If necessary,, wet 
the cloth with Cleaning Compound (Federal 
stock No. 7930-395-9542) and then wipe the 
parts with a dry clean cloth. 

3 All control knobs should work smoothly, be 

tight on the shaft, and should not bind.. 
Tighten all loose knobs and be sure that 
the knobs do not rub against the panel. 

7 Report to the higher echelon repairman any 

cut, worn, or broken cables, wires, or trans- 
mission lines. 

Warning: Cleaning compound is flammable and its 
fumes are toxic. Do not use near a fllame; provide ade- 
quate ventilation. 



21. Checking Fuses 

(fig. 7) 

a. Remove the fuses from the rear panel. 
See that they are of the proper value. If the 
receiver is to be operated from a 115-volt 
source with the OVENS switch at OFF, re- 
place the AC 3 AMP fuse with a 2-ampere 
fuse. If the receiver is to be operated from a 
230-volt source with the OVENS switch at ON, 
use a l 1 /^ -ampere fuse; use a 1-ampere fuse 
with the OVENS switch at OFF. 

Note. Receivers bearing Order No. 14-Phila-56, 
serial numbers 2683 and above, and Order No. 14385- 
Phila-58 have a % -ampere and a % -ampere fuse on 
the rear panel in addition to the AC 3 AMP fuse. 

b. If you replace a burned-out fuse with a 
new one and the new fuse burns out, notify 
a higher echelon repairman. 

Caution: To avoid serious damage to the 
receiver, do not use any fuse other than the 
value specified. 

22. Visual Inspection 

a. When the equipment fails to perform 
properly, turn the power off and check all the 
items listed below. Do not check any item with 
the power on. 

(1) Wrong settings of switches and con- 
trols (para 9 and 10). 

(2) Cables, headset cord, or antenna lead- 
in wire improperly connected. 

(3) Disconnected cables, plugs, or headset 
cord. 

(4) Grounded or broken antenna lead-in 
wire. 

(5) Burned-out fuses (usually indicate 
some other faults) (para 21). 

b. If the above checks do not locate the 
trouble, proceed to the operational checklist 
(para 23). 

23. Operational Checklist 

a. General. The operational checklist will 
help the operator to locate trouble quickly. The 
corrective measures are used to repair this 



26 




27 



trouble. If the measures suggested do not re- 
store normal operation, troubleshooting is re- 
quired by a higher echelon repairman. Note 
on the repair tag what corrective measures 
were taken and how the equipment performed 
at the time of failure. 



b. Procedure. Place the set in operation 
(para 13). After the equipment has had time 
to warm up, perform the steps shown in c 
below, in the order given. Observe the equip- 
ment operation and perform any corrective 
measures necessary. 



c. Checklist 



Action 


Normal indication 


Corrective measure 


FUNCTION switch at AGC. 


Dial lamps lighted. 


Check power cord and 
21 


fuses (para 




xvusning iioioc ui oigiicti nt;ciiu. m 
headset. 


Check headset 


cord and plug. 


1 Urn MHiljAb I LLEj L^xlAiN ur-Ci 

control to each band. 


x roper iiuinueio dppccti in xxc- 
quency-indicator window. 


Higher 


echelon 


repair 


required. 


Tune KILOCYCLE CHANGE con- 
trol to a desired station. 


Desired station is heard. 


Higher 


echelon 


repair 


required. 


Adjust ANT TRIM control for a 
maximum indication on CARRIER. 
LiFj\ HuLi meter. 


A maximum deflection of meter is 
obtained. 


Higher 


echelon 


repair 


required. 


Turn LOCAL GAIN control from 
minimum to maximum. 


Volume at loudspeaker or headest 
will increase. 


Higher 


echelon 


repair 


required. 


Turn LINE GAIN control from 
minimum to maximum. 


Output level to 600-ohm line or 
headset and LINE LEVEL meter 

■will irifrpfi (?p 

Will lllV/il/UOCa 


Higher 


echelon 


repair 


required. 


Turn RF GAIN control from 
minimum to maximum. 


Audio output and CARRIER LEVEL 
meter indication will increase. 


Higher 


echelon 


repair 


required. 


Turn FUNCTION switch to MGC. 


With no signal being received, noise 
level should increase slightly and 
CARRIER LEVEL not indicate. 


Higher 


echelon 


repair 


required. 


Tune KILOCYCLE CHANGE con- 

fvnl ■f/-» covovo 1 /\ i fforon 'f" C 1 0*T"1 £1 1 CI 
LIOl CO be VtJl al UllltJIclll/ big, Hdlo 

with FUNCTION switch at AGC. 


Output volume nearly constant. 


Higher 


echelon 


repair 


required. 


Turn TTTTXTPTTOXT cwifpVi f r> PAT 

and operate KILOCYCLE 
CHANGE control. 


Dpflppfinn nn CARRIER LEVEL 

J-ZcllcCl/lUIl UI1 v> xi. X \ XV X Hi X V XjX_J V XliX_i 

meter at each 100 kc reading. 


Higher 


echelon 


repair 


required. 


Turn LIMITER control to the right. 


Noise peaks are reduced in am- 
plitude. 


Higher 


echelon 


repair 


required. 


i urn Li1iNjl< MUji ii<iX switcn to u ana 
adjust LINE GAIN control for 
LINE LEVEL meter reading at 
VU mark. 


T TXTT? T TTVTTT motov vo^Hc of VTT 

mark. 


Higher 


echelon 


repair 


required. 


LINE METER switch at —10. 


LINE LEVEL meter reads com- 
pletely to right.. 


Higher 


echelon 


repair 


required. 


LINE METER switch at +10. 


LINE LEVEL meter reads -10. 


Higher 


echelon 


repair 


required. 


LINE METER switch at OFF. 


LINE LEVEL meter reads com- 
pletely to left. 


Higher 


echelon 


repair 


required. 


Turn BFO switch to ON. 












Turn KILOCYCLE CHANGE 
control. 


A whistle-like tone is heard as each 
station is tuned in. 


Higher 


echelon 


repair 


required. 


Turn BFO PITCH control. 


The pitch of the tone changes. 


Higher 


echelon 


repair 


required. 



28 



Action 


Normal indication 


Corrective measure 


Turn BANDWIDTH KC 
each position from 16 


switch to 
to .1. 


Selectivity becomes sharper and 
noise decreases. Only low fre- 
quency audio tones are heard in 
the .1 position. 


Higher 


echelon repair 


required. 


Turn FUNCTION switch 
STAND BY. 


to 


No noise or signal is heard, dial 
lamps remain lighted. 


Higher 


echelon repair 


required. 


Turn FUNCTION switch 
OFF. 


to 


Dial lamps go out. 


Higher 


echelon repair 


required. 



29 



CHAPTER 4 

SHIPMENT AND LIMITED STORAGE AND DEMOLITION 
TO PREVENT ENEMY USE 



24. Disassembly 

The following instructions are recommended 
for preparing the receiver for transportation 
and storage: 

a. Disconnect the antenna lead-in cable. 

J). Remove all connections to the rear-panel 
terminal strips of the receiver. 

c. Unplug the headphone cord from the 
front panel PHONES jack. 



Section I. SHIPMENT AND LIMITED STORAGE 

d. Disconnect the power cable from the ac 
outlet. Wind the cable around the clips pro- 
vided on the receiver rear panel. 



25. Repacking for Shipment or 
Limited Storage 

Repacking for shipment or limited storage 
is normally done at a higher echelon level. 



Section II. DEMOLITION OF MATERIEL TO PREVENT ENEMY USE 



26. Authority for Demolition 

The receiver and its accessories will be de- 
molished only upon the order of the com- 
mander. The destruction procedures outlined 
in paragraph 28 will be used to prevent the 
enemy from using or salvaging the equipment. 

27. Methods of Destruction 

Use any or all of the methods listed in a 
through / below to make the equipment com- 
pletely useless. 

a. Smash. Smash the controls, tuning 
mechanism, tubes, coils, switches, capacitors, 
transformers, filters, and meters; use sledges, 



axes, handaxes, pickaxes, hammers, crowbars, 
or other heavy tools. 

b. Cut. Cut the power cord, the antenna 
lead-in cable, and the headset cord; use an 
axe, a handaxe, or a machete. 

c. Burn. Burn cords, cables, and manuals; 
use gasoline, kerosene, oil, flamethrowers, or 
incendiary grenades. 

d. Bend. Bend the panel, the cabinet, and 
the main frame. 

e. Explosives. If explosives are necessary, 
use firearms, grenades, or TNT. 

/. Disposal. Bury or scatter the destroyed 
parts in slit trenches or foxholes, or throw 
them into streams. 



30 



APPENDIX I 
REFERENCES 



Following is a list of applicable references 


T7 , i\/r 
r M 


01 


pr 
-0 


that are available 


to the operator of Radio 


FM 


21- 


-6 


Receiver R-390A/URR:: 








DA PAM 108-1 


Index of Army Motion Pic- 


FM 


21- 


-30 




tures, Film Strips, Slides, 


SR 


320 


-5 




and Phono Recordings. 








DA PAM 310-4 


Index of Technical Man- 


SR 


320 


-50 




uals, Technical Bulletins, 










Supply Bulletins, Lubri- 


TM 


11- 


-649 




cation Orders, and Modi- 









fication Work Orders. 



Military Training. 

Techniques of Military In- 
struction. 

Military Symbols. 

Dictionary of United States 
Army Terms. 

Authorized Abbreviations 
and Brevity Codes. 

Radio Receiving Sets 
AN/FRR-40 and 
AN/FRR-41. 



31 



APPENDIX II 
BASIC ISSUE ITEMS LIST 
RADIO RECEIVER R-390A/URR 



Section II. INTRODUCTION 



1. Scope 

a. This appendix lists items supplied for 
initial operation and for running spares. The 
list includes tools, accessories, parts, and mate- 
rial issued as part of the major end item. The 
list includes all items authorized for basic 
operator maintenance of the equipment. End 
items of equipment are issued on the basis of 
allowances prescribed in equipment authori- 
zation tables and other documents that are a 
basis for requisitioning. 

b. The columns are as follows : 

(1) Source, maintenance, and re cover abil- 
ity code. Not used. 

(2) Federal stock number. This column 
lists the 11-digit Federal stock num- 
ber. 

(3) Designation by model. Not used. 

(4) Description. Nomenclature or the 
standard item name and brief identi- 
fying data for each item are listed in 
this column. When requisitioning, 
enter the nomenclature and descrip- 
tion on the requisition. 

(5) Unit of issue. The unit of issue is the 
supply term by which the individual 
item is counted for procurement, stor- 
age, requisitioning, allowance, and is- 
sue purposes. 



(6) Expendability. Expendable items are 
indicated by the letter X ; nonexpend- 
able items are indicated by NX. 

(7) Quantity authorized. Under "Items 
Comprising an Operable Equipment" 
the column lists the quantity of items 
supplied for the initial operation of 
the equipment. Under "Running 
Spares and Accessory Items" the 
quantities listed are those issued ini- 
tially with the equipment as spare 
parts. The quantities are authorized 
to be kept on hand by the operator 
for maintenance of the equipment. 

(8) Illustrations. The "Figure No." col- 
umn lists the illustrations in which 
the items appear. The "Item No." 
column lists the reference designa- 
tions that appear on the part in the 
equipment. These designations are 
also used on any illustrations of the 
equipment. 

2. Critical Items 

A zero slash (<£) in the "Description" column 
indicates items that are expected to fail during 
the first year or items that will make the 
equipment inoperative if they fail. 



32 



ci3ziaoHinv 
AiiiNvno 



3 AiniaVQN3dX3 



3HSSI 

jo iiNn 



CO 



< 

■J 
< 

z 
g 
»— 

u 
z 

3 



c 
o 

u 

d> 
to 



I 

f fflifff 



-I 



Is 



i 2 

<- r-. 



:§::' : f _ r ! ?; = 

5 >- S S £ 5 i S '-, 



If 

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- 1- 




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12 

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33 



By Order of Wither M. Brucker, Secretary of the Army: 



Official : 

R. V. LEE, 

Major General, United States Army, 
The Adjutant General. 



G. H. DECKER, 

General, United States Army, 
Chief of Staff. 



Distribution : 

Active Army: 

To be distributed in accordance with DA Form 12-7 requirements for TM 11 Series (UNCL) plus the 
following formula: 

USASA (2) n - 57 

CNGB (1) ll- 85 

Tech Stf, DA (1) except CSigO (18) H-86 

DASA (5) n - 98 

US ARADCOM (2) 11-117 

US ARADCOM Rgn (2) 11-155 

MD W (1) 11-500 (AA-AE) (4) 

Seventh US Army (2) 11-557 

EUSA (2) 11-587 

Units org under fol TOE: (2 copies each 11-592 

except as indc) 11-597 

H-7 32-51 

11-16 32-56 

11-32 32-57 
NG: State AG (3); Units — Same as Active Army except allowance is one copy for each unit. 
USAR: None. 

For explanation of abbreviations used, see AR 320-50. 



U. S. GOVERNMENT PRINTING OFFICE: 1961—570987/84 



34